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Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams

Cooper, Charles Austin
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054146649

Abstract Details

2003, PhD, University of Cincinnati, Engineering : Chemical Engineering.
The separation properties of supported silicalite membranes, with a bimodal pore size distribution made from silicalite particles that were grown by hydrothermal synthesis for 0.5, 1, 2, and 3 days, were studied. The membranes consisted of a silicalite layer, from a 10 wt.% silicalite suspension, on an α-alumina or stainless steel support, sometimes modified with DCDMS (dichlorodimethyl silane) to add surface methyl groups to the silicalite layer. However, it was found that LIX-84 (2-hydroxy-5-nonylacetophenome oxime) was not entrapped within the pores of the silicalite due to hydrophobic interactions as hoped. None of the membranes made from silicalite using the various types of silicalite and the various modification techniques demonstrated good stability (no sign of metal selectivity). Regardless of operating conditions, of the six metals studied (Ca, Cd, Cu, Pb, Zn, & Ni) no selectivity was ever seen. Mesoporous silica particles were modified with LIX-84 (2-hydroxy-5-nonylacetophenome oxime). The LIX-84 was attached to the surface of silica via non-covalent forces. The adsorbent had a capacity of 0.6 mmol Cu++/g adsorbent at room temperature and a capacity of 1.1 mmol Cu++/g adsorbent at 60°C. Depending on solution pH the adsorbent had varying capacity for copper(2+), nickel(2+), and lead(2+). The adsorbent was found to have good stability and gave high metal recovery when regenerated with 2 vol. % nitric acid. An increased ion-exchange rate was achieved and was attributed to the use of larger pore size silica. The silica was found to contain from 5-7 wt. % by weight LIX-84. Silica SLMs were synthesized and studied. The membranes consisted of a silica layer, from dip-coated colloidal silica, on an a-alumina support, modified with DCDMS (dichlorodimethyl silane) to add surface methyl groups to the silica layer. LIX-84 (2-hydroxy-5-nonylacetophenome oxime) was entrapped within the pores of the silica due to hydrophobic interactions between the surface methyl groups and the long hydrocarbon chain from the LIX-84. The membranes made after 2-time dip-coating demonstrated good stability (no sign of LIX loss after 12 days) and uphill Cu2+ transport against the concentration gradient. Regardless of operating conditions, of the six metals studied (Ca, Cd, Cu, Pb, Zn, & Ni), only Cu(2+) showed any flux except for some experiments in which Ca2+ flux could be attributed to imperfections in the membrane. Cu2+ fluxes as high as 2.3 x10 -10 moles/cm2 s (with 40 ppm Cu2+ feed) and permeability coefficients as high as 8.0 x10-4 cm/s were obtained for these mesoporous inorganic SLMs.
Dr. Jerry Lin (Advisor)
250 p.
supported liquid membrane; inorganic; hybrid; separation

Recommended Citations

Citations

  • Cooper, C. A. (2003). Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054146649

    APA Style (7th edition)

  • Cooper, Charles. Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams. 2003. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054146649.

    MLA Style (8th edition)

  • Cooper, Charles. "Synthesis and Characterization of Mixed Matrix Systems for the Removal and Recovery of Divalent Metals from Waste Streams." Doctoral dissertation, University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054146649

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Cincinnati and OhioLINK.